Hello, I have a TT XL..here's the info:

[TomTomGo]
DeviceName=TomTom XL
DeviceVersionHW=XL
BootLoaderVersion=55274
ApplicationVersionVersionNumber=9151
ApplicationVersion=605385.2
CurrentMap=USA_Canada_and_Mexico_P
CurrentMapVersion=860.3121

Now, I'm planning to update the map, but do I have to update or change the navcore too??

Thanks! Learning...